We began by comparing the fundamentals: their size, their engines, physical data and how these would compare in a normalized way. Now we continue by looking at the drag characteristics of the airframes and what this means for their fuel consumption.
Any difference in fuel consumption between the E195-E2 and the A220-300 will be done to the optimization of the airframes, as they share the same engine.
The drag picture for the E195-E2 versus the A220-300 is a mixed bag. One is better on normalized friction drag (drag due to size) the other on induced drag (drag due to weight).